I had low back and leg pain. I was diagnosed with spondylolisthesis at L4/L5 ( L4 was slipping forward off of L5). Physical therapy and injections did not help and I was told fusion of L4/L5 was the only cure. I began doing weight training, specifically dead lifts and squats. Within 6 weeks the pain was gone. I am 74 years old, 164 pounds and now dead lift 220 and squat 160.